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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.5K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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High Entropy Oxide Relaxor Ferroelectrics.

Yogesh Sharma1,2, Min-Cheol Lee2, Krishna Chaitanya Pitike1

  • 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.

ACS Applied Materials & Interfaces
|February 28, 2022
PubMed
Summary
This summary is machine-generated.

This study synthesizes highly disordered perovskite films, Ba(5B)O, demonstrating stable relaxor ferroelectric properties without a narrow phase transition. This approach enables designing advanced materials for energy storage and conversion applications.

Keywords:
configurational disorderdielectricshigh entropy oxidesperovskite oxidesrelaxor ferroelectricsthin film epitaxy

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Crystallography

Background:

  • Relaxor ferroelectrics exhibit valuable properties like strong electromechanical response and energy storage.
  • Current material design often relies on subtle compositional changes, limiting performance.
  • Discovering new relaxor ferroelectrics is crucial for advanced technological applications.

Purpose of the Study:

  • To explore relaxor ferroelectric behavior in highly compositionally complex perovskites.
  • To synthesize and characterize single-crystal Ba(Ti0.2Sn0.2Zr0.2Hf0.2Nb0.2)O3 [Ba(5B)O] films.
  • To investigate the impact of configurational disorder on ferroelectric properties.

Main Methods:

  • Entropy-assisted synthesis of single-crystal Ba(5B)O films.
  • Temperature-dependent dielectric, Raman spectroscopy, and second-harmonic generation measurements.
  • First-principles theory calculations for predicting new material compositions.

Main Results:

  • Successful synthesis of single-crystal Ba(5B)O films with high configurational disorder.
  • Observation of multiple phase transitions, a high Curie temperature (570 K), and relaxor ferroelectric behavior.
  • Demonstration that strong compositional complexity stabilizes relaxor responses.

Conclusions:

  • Highly disordered perovskites can exhibit stable relaxor ferroelectric properties.
  • This approach offers a new pathway for designing high-performance ferroelectric materials.
  • Ba(5B)O films show potential for piezoelectric, pyroelectric, and electrocaloric applications.